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Mechanisms of Resistance to Diclofop of Two Wild Oat (Avena fatua) Biotypes from the Willamette Valley of Oregon

Published online by Cambridge University Press:  12 June 2017

Steven S. Seefeldt ,
E. Patrick Fuerst ,
David R. Gealy ,
Amit Shukla ,
Gerard P. Irzyk  and
Malcolm D. Devine
Steven S. Seefeldt
Affiliation:
Dep. of Crop and Soil Sci., Washington State Univ., Pullman, WA 99164
E. Patrick Fuerst
Affiliation:
Dep. of Crop and Soil Sci., Washington State Univ., Pullman, WA 99164
David R. Gealy
Affiliation:
USDA-ARS, Stuttgart, AR 72160
Amit Shukla
Affiliation:
Dep. of Crop Sci. and Plant Ecol., Univ. of Saskatchewan, Saskatoon, Saskatchewan, S7N 5A8
Gerard P. Irzyk
Affiliation:
Dep. of Crop and Soil Sci., Washington State Univ., Pullman, WA 99164
Malcolm D. Devine
Affiliation:
Dep. of Crop Sci. and Plant Ecol., Univ. of Saskatchewan, Saskatoon, Saskatchewan, S7N 5A8
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Abstract

Laboratory experiments were conducted to determine the mechanism of resistance to diclofop in two wild oat biotypes (designated ‘B’ and ‘C’ biotypes) from the Willamette Valley of Oregon. Resistance could not be attributed to differential absorption, translocation, or metabolism of diclofop. Resistance was not correlated with membrane plasmalemma repolarization following diclofop acid treatment. Compared to a susceptible (’S') wild oat biotype, acetyl CoA carboxylase from the B and C biotypes showed a 10.3 and 4.5 fold increase in the level of resistance, respectively, to diclofop acid. Cross-resistance to fenoxaprop acid was 5.5 and 7.3 times higher in the B and C biotypes, respectively than the S biotype. Correlation between resistance at the whole plant level and at the ACCase level was good for diclofop and fenoxaprop in the B biotype. For the C biotype, this correlation was not as good. Possible reasons for the discrepancy are given.

Keywords

Diclofop, ((+)-2-[4-(2,4-dichlorophesnoxy)phenoxy]propanoic acid)fenoxaprop, {(+)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acid}wild oat (Avena fatua L.♯ AVEFA)Herbicide resistance
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 4 , December 1996 , pp. 776 - 781
Copyright
Copyright © 1996 by the Weed Science Society of America 

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